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Acceleration of Gravity If an object is falling towards the earth surface then you use g or a g = -9.81 m/s 2. *This means that an object speeds up 9.8 m/s every second. *It is negative because objects fall downward. If the object is simply moving, use normal equations to solve for displacement and acceleration.

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Problem Solving Tips Anything going down is Object starting from rest Object that is stopping Object at its peak when thrown up When dropping an object, we know Time up = time down in vertical displacement